<template>
  <div class="login-container">
    <!-- 顶部工具栏 -->
    <div class="top-bar">
      <el-switch v-model="isDark" inline-prompt active-icon="Moon" inactive-icon="Sunny" @change="toggleTheme" />
      <lang-select class="ml-2 cursor-pointer" />
    </div>
    <!-- 登录表单 -->
    <el-card class="login-card">
      <div class="text-center relative">
        <h2>{{ defaultSettings.title }}</h2>
        <el-tag class="ml-2 absolute-rt">{{ defaultSettings.version }}</el-tag>
      </div>

      <el-form ref="loginFormRef" :model="loginData" :rules="loginRules" class="login-form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <div class="input-wrapper">
            <i-ep-user class="mx-2" />
            <el-input ref="username" v-model="loginData.username" :placeholder="$t('login.username')" name="username"
              size="large" class="h-[48px]" />
          </div>
        </el-form-item>

        <!-- 密码 -->
        <el-tooltip :visible="isCapslock" :content="$t('login.capsLock')" placement="right">
          <el-form-item prop="password">
            <div class="input-wrapper">
              <i-ep-lock class="mx-2" />
              <el-input v-model="loginData.password" :placeholder="$t('login.password')" type="password" name="password"
                @keyup="checkCapslock" @keyup.enter="handleLoginSubmit" size="large" class="h-[48px] pr-2"
                show-password />
            </div>
          </el-form-item>
        </el-tooltip>

        <!-- 验证码 -->
        <el-form-item prop="captchaCode">
          <div class="input-wrapper">
            <svg-icon icon-class="captcha" class="mx-2" />
            <el-input v-model="loginData.captchaCode" auto-complete="off" size="large" class="flex-1"
              :placeholder="$t('login.captchaCode')" @keyup.enter="handleLoginSubmit" />

            <el-image @click="getCaptcha" :src="captchaBase64" class="captcha-image" />
          </div>
        </el-form-item>

        <!-- 登录按钮 -->
        <el-button :loading="loading" type="primary" size="large" class="w-full" @click.prevent="handleLoginSubmit">{{
          $t("login.login") }}
        </el-button>

      </el-form>
    </el-card>

  </div>
</template>

<script setup lang="ts">
// 外部库和依赖
import { LocationQuery, useRoute } from "vue-router"

// 内部依赖
import { useSettingsStore, useUserStore } from "@/store"
import AuthAPI, { LoginData } from "@/api/auth"
import router from "@/router"
import defaultSettings from "@/settings"
import { ThemeEnum } from "@/enums/ThemeEnum"

// 类型定义
import type { FormInstance } from "element-plus"

// 导入 login.scss 文件
import "@/styles/login.scss"

// 使用导入的依赖和库
const userStore = useUserStore()
const settingsStore = useSettingsStore()
const route = useRoute()
// 窗口高度
const { height } = useWindowSize()
// 国际化 Internationalization
const { t } = useI18n()

// 是否暗黑模式
const isDark = ref(settingsStore.theme === ThemeEnum.DARK)
// 是否显示 ICP 备案信息
const icpVisible = ref(true)
// 按钮 loading 状态
const loading = ref(false)
// 是否大写锁定
const isCapslock = ref(false)
// 验证码图片Base64字符串
const captchaBase64 = ref()
// 登录表单ref
const loginFormRef = ref<FormInstance>()

const loginData = ref<LoginData>({
  username: "admin",
  password: "123456",
} as LoginData)

const loginRules = computed(() => {
  return {
    username: [
      {
        required: true,
        trigger: "blur",
        message: t("login.message.username.required"),
      },
    ],
    password: [
      {
        required: true,
        trigger: "blur",
        message: t("login.message.password.required"),
      },
      {
        min: 6,
        message: t("login.message.password.min"),
        trigger: "blur",
      },
    ],
    captchaCode: [
      {
        required: true,
        trigger: "blur",
        message: t("login.message.captchaCode.required"),
      },
    ],
  }
})

/** 获取验证码 */
function getCaptcha() {
  AuthAPI.getCaptcha().then((res) => {
    loginData.value.captchaKey = res.data.code_id
    captchaBase64.value = 'data:image/png;base64,' + res.data.image_url
  })
}

/** 登录表单提交 */
function handleLoginSubmit() {
  loginFormRef.value?.validate((valid: boolean) => {
    if (valid) {
      loading.value = true
      userStore
        .login(loginData.value)
        .then(() => {
          const { path, queryParams } = parseRedirect()
          router.push({ path: path, query: queryParams })
        })
        .catch(() => {
          getCaptcha()
        })
        .finally(() => {
          loading.value = false
        })
    }
  })
}

/** 解析 redirect 字符串 为 path 和  queryParams */
function parseRedirect(): {
  path: string
  queryParams: Record<string, string>
} {
  const query: LocationQuery = route.query
  const redirect = (query.redirect as string) ?? "/"

  const url = new URL(redirect, window.location.origin)
  const path = url.pathname
  const queryParams: Record<string, string> = {}

  url.searchParams.forEach((value, key) => {
    queryParams[key] = value
  })

  return { path, queryParams }
}

/** 主题切换 */
const toggleTheme = () => {
  const newTheme = settingsStore.theme === ThemeEnum.DARK ? ThemeEnum.LIGHT : ThemeEnum.DARK
  settingsStore.changeTheme(newTheme)
}

/** 根据屏幕宽度切换设备模式 */
watchEffect(() => {
  if (height.value < 600) {
    icpVisible.value = false
  } else {
    icpVisible.value = true
  }
})

/** 检查输入大小写 */
function checkCapslock(event: KeyboardEvent) {
  // 防止浏览器密码自动填充时报错
  if (event instanceof KeyboardEvent) {
    isCapslock.value = event.getModifierState("CapsLock")
  }
}

onMounted(() => {
  getCaptcha()
})
</script>

<style lang="scss" scoped></style>
